Definition
An energy recovery ventilator (ERV) is a balanced whole-house ventilation appliance that exchanges stale indoor air for filtered outdoor air through a core that transfers both heat and some water vapor between the two airstreams. That moisture transfer helps keep indoor humidity steadier than a heat recovery ventilator, which transfers heat only.
Also called: ERV
Why it matters to you
In the marine Pacific Northwest, where winter moisture removal is usually the priority, a heat recovery ventilator is the more common choice, but an ERV can suit homes where indoor air runs dry in winter or where summer humidity control matters. The right pick depends on the house, its occupants, and how it is used.
Practical guidance
Homeowners can keep ERV filters clean and note any persistent window condensation or overly dry air. Choosing between an ERV and HRV, sizing it, and balancing airflow should follow a technician's indoor air quality assessment.
About this definition
Written by the Home Energy Group team — a family-owned HVAC company celebrating 25 years of comfort & care across SW Washington and the Portland metro, licensed in Washington (WA LIC# HOMEEGI003J7) and Oregon (OR CCB# 184255). Definitions inform; an on-site diagnosis decides.
